Because James Brown is the basis of hip hop, house, disco, soul, funk, ska, reggae, and is at the core of just about every modern musical movement in popular culture since the 1950's. As FunkyJE put it below, "James Brown = Hip Hop", breakbeat sample culture.

Wow, what was up with this guy? A lot of obscure artist usually have a few individual songs sampled two or three times, then there's that one song with a laundry list of other songs it was sampled in. And almost all of this man's songs are like that, while Funky Drummer still takes the cake :P

I know this is the worst description ever, but I need a specific high-pitched squeal from a James Brown song, which gets higher as it goes and last about 2-3 seconds. Any guesses as to what it could be?

"Soul Pride" has definitely got more legs in it than is represented here, it was pretty much the entire base for the jungle scene from 1994. Admittedly it was chopped in with Amen and Tramen breaks but it was pretty much ripped without pitch changes!